Arrangement of microtubules in a flagellum and a centriole is respectively

Options

A. 9 + 2 and 9 + 1
B. 9 + 1 and 9 + 0
C. 9 + 0 and 9 + 7
D. 9 + 2 and 9 + 0

Answer

D

Explanation

A centriole possesses a whorl of nine peripheral fibrils. Fibrils are absent in the centre. The arrangement is, therefore, called `9 + 0`. Flagellum contans an axoneme of a peripheral doublet fibrils and 2 central singlet fibrils. This arrangement is called `9 +2` or 11 stranded.